Crossword Genius

Belief system suffix (3)

Ross

I believe the answer is:

ism

(Other definitions for ism that I've seen before include "Belief system" , "Distinctive doctrine or practice" , "Informal noun or suffix for doctrine or practice" , "Informal doctrine found in Bismarck" , "Distinctive theory" .)

I've seen this clue in the LA Times and the USA Today.
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